Lord Hamilton was appointed Lord President in December 2005. He was appointed a Judge in 1995. He is a graduate of the Universities of Oxford (BA, Worcester College) and Edinburgh (LLB). He was admitted to the Faculty of Advocates in 1968 and was Standing Junior Counsel to the Scottish Development Department (1975-78) and the Inland Revenue (1978-82). He served as an Advocate Depute from 1982 to 1985.
From 1988 to 1995 he was a Judge of the Courts of Appeal of Jersey and Guernsey, and from 1992 to 1995 he was President of the Pensions Appeal Tribunals for Scotland. In June 2003 he was elected an Honorary Fellow of Worcester College, Oxford and in January 2006 an Honorary Bencher of the Inner Temple, London.